Rotary pump



y 1954 F. SCOGNAMILLO 2,684,037

ROTARY PUMP Filed March 20, 1952 Patented July 20, 1954 ROTARY PUMP lFrank-scognamillo, Fair Lawn, N. J .assignor to Scognamillo Engineering" Company,

Bronx,

'N. Y., a company of New York Application Mai-ch20, 1952, Serial No. 277,577

1 Claim. -1

The invention herein disclosed relates to rotary pumps of the type disclosed in copending patent application Serial No. 168,417, filed June 16, 1950, issued as Patent 2,590,728 on March 25, 1952, in which the blades of the pump are slidingly confined in slots in a rotor operating eccentrically in a cylindrical pump chamber.

The present invention is a continuation in part of the subject matter disclosed in said patent.

Objects of the present invention are to accurately control radial movement of the blades in the pump chamber to maintain either 'adesired clearance or close fitting engagement of the blades with the walls of the chamber and to accomplish this with a minimum of friction and in an entirely practical, simple, inexpensive form of construction.

Special objects of the invention are to eifect adequate sealing of the ends of the blades inthe rotor slots and to insure free running operation of the blades in the pump chamber at all times and under all conditions.

Further special objects of the invention are to maintain eliective control of the pump blades radially inwardly as well as radially outwardly of the rotor structure without applying undue frictional loads on the blades or other portions of the pump.

Further objects of the invention are to attain the ends mentioned with a construction of few parts and of rugged design adapted for continuous operation without servicing or other attention.

Other desirable objects attained by the invention are set forth or will appear in the course of the following specification.

The drawing accompanying and forming part of the specification illustrates present practical embodiments of the invention. Structure, however, may be modified and changed as regards the immediate disclosure, all within the true intent and scope of the invention as hereinafter defined and claimed.

Fig. l in the drawing is an end view of a pump incorporating features of the invention, showing the rotor and sliding blades within the pump chamber as they appear on removal of the end or cover plate of the pump;

Fig. 2 is a broken vertical sectional view of the pump as on substantially the plane of line 2-2 of Fig. 1;

Fig. 3 is a view similar to Fig. 2, showing a modified form of construction.

In the illustration, the shaft of the pump or rotary machine is shown at 5 carrying a rotor 6 ISO having radial slots 1 slidingly receiving the blades 8 which are constrained to operate concentrically in'the cylindrical chamber in which the shaft is eccentrically journaled.

This chamber is shown as made up of parallel endwalls 9 and it connected by a cylindrical'annular wall I I The inlet and outlet ports, which may be considered as reversible, according to the direction of rotation of the rotor, are indicated at I2 and I3 opening through the cylindrical wall of the pump chamber at opposite sides of the rotor.

To maintain a desirable sealing relation between the rotcr, blades and pump casing, the

ends-of the blades are made flush with the ends of the rotor and both blades and rotor ends are in running engagement or cooperative relation with the annular end walls of the cylindrical pump chamber, substantially as indicated at l4.

Desired control of the radial movement of the blades is effected and maintained in the first form of the invention illustrated, Figs. 1 and 2, by provision of bronze or other antifriction bearing rings I5 on stationary hubs I6 on the end walls concentric with the surrounding cylindrical wall and by bronze or other antifriction rings ll of angular cross section disposed in correspondingly angular cross sectional seats I8 in the housing.

The ends of the rotor are relieved to provide the concentric annular seats l9 to accommodate the stationary end hubs I6 and bearing rings I5, and to leave the inner, longitudinal edges at opposite ends of the blades clear to engage and ride these rings.

Rings I5 are thus eiiective to hold the blades radially outwardly in the slots, and while usually preferred to have these rings freely rotatable on the hubs IE, it is contemplated that they may be stationary, as by giving them a press fit on the hubs.

The angular cross section rings I7, seated flush in the annular corners of the cylindrical chainher, have their radially inwardly extending flanges 20 in engagement or co-operative relation to the ends of the blades and the rotor, and their laterally or axially extending flanges 2| in over-lapping relation over the outer longitudinal edges at the ends of the blades.

The two angularly related flanges 20 and 2| of rings I'I thus confine the outer corner edges of the blades to control them in longitudinal as well as in radially outwardly shifting relation.

Rings I! may thus be designed to maintain a predetermined definite clearance between the outer longitudinal edges of the blades and the surrounding cylindrical wall of the pump chamber, for purposes such as handling liquids or fluids containing solids or a certain size.

The form of the invention shown in Fig. 3 differs from that described, particularly in that the inner, smaller diameter rings, instead of being flat as in Fig. 2, are formed with radially outwardly extending annular flanges 22 seating in annular recesses 23 in the end Walls of the casing, thus to apply longitudinal as well as radial control to the blades.

In this particular form of the invention an annular land 24 is left on the end walls of the pump chamber between the end flanges 20 and 22 of the outer and inner rings to guide and control these rings in their respective orbits.

With the rings free to rotate, they may turn with the rotor and blades or at times remain stationary, depending on operating conditions, independently of each other and independently of the rotor and the blades carried thereby.

The pump is thus made self-compensating for various factors and the blades are sealed and controlled Without imposing frictional loads on them.

lhe parts are few in number and of simple, rugged design, adapted to stand up under heavy, continuous operating loads.

What is claimed is:

A rotary machine of the character disclosed, comprising a casing having opposed end walls connected by a cylindrical Wall and forming therewith a cylindrical chamber, a shaft journaled in and eccentrically of said chamber, a concentric rotor on said shaft in eccentric relation to said cylindrical chamber, ports in said chamher opening through said cylindrical wall at diametrically opposite sides of the rotor, said rotor having radial slots therein, radially disposed blades slidably confined in said slots with their outer longitudinal edges opposed to and in cooperative relation to the surrounding cylindrical wall and their radially extending end edges flush with the ends of the rotor and in cooperative relation to the end walls of the cylindrical chamber, stationary hubs on the opposite end walls of said chamber concentric with said cylindrical wall, bearing rings on said stationary hubs in supporting engagement with the inner, longitudinal edges of the blades at the ends of the blades, the ends of the rotor being relieved to admit the stationary hubs and the bearing rings into cooperative relation with the inner longitudinal edges of the blades, and outer bearing rings for the outer, corner edges of the blades, said outer bearing rings being of angular cross section and having angularly related, radially extending flanges and connected axially extending flanges respectively engaging the radially extending end and longitudinally extending outer edges of the blades, the bearing rings on said stationary hubs having radially extending flanges at the outer ends of the same and the end walls of the casing having annular seats to receive the radially extending flanges of the inner and outer bearing rings and annular lands between said annular seats.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 959,049 Boland May 24, 1910 2,447,961 Rodway Aug. 24, 1948 2,590,728 Scognamillo Mar. 25, 1952 FOREIGN PATENTS Number Country Date 114,584 Great Britain Apr. 11, 1918 445,878 Great Britain Apr. 20, 1936 

